Several major websites go down in widespread internet outage

Several major websites were down on Thursday in what appears to be a widespread outage.

Akamai, a content distribution network, or CDN, which helps data move around the internet, said on its website it's investigating "an emerging issue with the Edge DNS service." The company said it expects to provide an update on its service disruption around 1 p.m. Eastern Time.

Oracle, a cloud service provider, said Thursday afternoon it is "monitoring a global issue related to Akamai edge DNS that is impacting access to many internet resources, including Oracle cloud properties."

Oracle said resources within its cloud service are not impacted by the incident.

Delta Air Lines, British Airways, Capital One, Go Daddy, Vanguard, UPS, LastPass, AT&T and Costco were among the websites loading slowly or showing "DNS failure."

Some of the outages appear localized, meaning some users may be able to access the sites while others cannot.

The Delta outage means customers can't check in for flights or look up fares online, but the company said customers can check in with a Delta agent at the airport.

"We're experiencing temporary technical issues serving our customers on delta.com and the Fly Delta mobile app," said a message on Delta's website. "We apologize for the delay, and are working to restore the site as quickly as possible."

This is breaking news. Please check back for updates.

-CNBC's Leslie Josephs contributed to this report.